Create a decibel-kde library for representing contacts based on the representation used by kopete.
Also add an akonadi resource and a serializer to store these in akonadi, and add preliminary use of them to the akonadi contactconnetor.

This should be functional, but very much proof-of-concept.
Also the build system is a bit of a mess, so if you try it and have problems building it, please submit patches :).

Merge branch 'akonadi-kopete-contact-akademy'